Photodiodes are a two-electrode, radiation-sensitive junction formed in a semiconductor material in which the reverse current varies with illumination. Photodiodes are used for the detection of optical power and for the conversion of optical power to electrical power.   Photodiodes can be PN, PIN, or avalanche. PN photodiodes feature a two-electrode, radiation-sensitive PN junction formed in a semiconductor material in which the reverse current varies with illumination.   PIN...
Learn More about Photodiodes


Q & A on Photodiodes

We asked our users for their input on Photodiodes. Here are the results of 101 users familiar with Photodiodes.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing photodiode design?
13 answers
Answers:
High Precision, High frame rate need will be influencing photodiode design.
~Research & Development, Shanghai, China
Silicon Photomultipliers also called Multi Pixel Photon Counters
~Catania, Italy
Avalanche photodiodes development. Multi-detectors photodiodes.
~Research & Development, Moscov, Russia
See More Answers
Q:
From your perspective, which companies are creating the most innovative photodiodes?
17 answers
Answers:
Hamamatsu, UDT. but most volume applications cannot afford these. Tend to go for generic low cost parts from companies like Vishay etc
~Research & Development, Mt. Waverley, Australia
Hamamatsu, New Focus, Thorlabs...
~Rama Raj, Research & Development, Marcoussis, FRANCE
Vishay, Honeywell, Hamamatsu
~Research & Development, Moscov, Russia
See More Answers

Applications and UseTop

Q:
What are some of the applications you have used photodiodes for?
30 answers
Answers:
Aerosol spectrometers, chilled-mirror hygrometers, sunlight duration sensors, anemometry, refractive index sensors, droplet discriminators, Cherenkov radiation detection (apd),fog detection, ambient light level detection, rainfall rate sensors + others now lost in the mists of time.......
~Research & Development, Barnard Castle, United Kingdom
Used as a detector to sense X ray radiation for my final year project entitled "The Development of Electronic Personal Dosimeter".
~Other, Kuala lumpur, Malaysia
Object Detectors, mainly. Quite a number of different applications but for the same purpose.
~Engineering, Consulting, Montreal, Canada
See More Answers
Q:
Please share with us any “non-standard” applications that photodiodes have been used for.
7 answers
Answers:
New system for solar alignment (The overall cost got reduced by 1/3 of commercial solutions)
~Engineering, Faculty/Staff/Student, Florianópolis, Brazil
As a sensor for automatic day and night switch.
~DINESH JAGADAL, Design Engineer, HUBLI, INDIA
Upconversion detection, automatic alignment...
~Rama Raj, Research & Development, Marcoussis, FRANCE
See More Answers
Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of photodiodes?
7 answers
Answers:
In building TIA Rosa's check the requirement for PINA bondwire inductance and length as Bandwidth may be very dependent on this parameter.
~Engineering, Other, Bristol, Great Britain
Only for beginners. Things like not considering noise, amplifier stability etc
~Research & Development, Mt. Waverley, Australia
Photodiodes with low leakage but high junction capacitance.
~Shaofeng Wang, Design Engineer, Beijing, China
See More Answers

FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
12 answers
Answers:
Wide spectral response, especially toward the violet end (400nm) and low cost.
~Research & Development, Mt. Waverley, Australia
As a sensor in day/night switch. Dawn it is on in day it will be off.
~DINESH JAGADAL, Design Engineer, HUBLI, INDIA
Array with passive alignment and aspheric lenses integrated on top
~Design Engineer, Cornate d'adda, Italy
Variable sensitivity without the need of external components.
~Engineering, Faculty/Staff/Student, Florianópolis, Brazil
A fast photodiode for 3micron region, at room temperature.
~Research & Development, Sao Carlos, Brazil
Ultra low noise APD with GBP of 100 GHz
~Wolfgang P, Design Engineer, Berlin, Germany
Ease of use, speed and sensitivity
~Rama Raj, Research & Development, Marcoussis, FRANCE
Dimension, arc coating, thickness
~Engineering, Process/Production, Bangalore, India
Fast Response time Big Array
~Research & Development, Shanghai, China
Particular spectral response
~Research & Development, Basingstoke, United Kingdom
Sipm/smaller dimensions
~Prabhakara Rao Y, Additional General Manager Semiconductors, Bangalore, India
Signal to Noise Ratio
~Babar H, Research & Development, Islamabad, Pakistan

Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of photodiodes?
6 answers
Answers:
Sometimes grounding the PD casing causes problems. Wire connections for PDs should be as short as possible. Sensitive area of the PD matters for some sophisticated applications.
~Babar H, Research & Development, Islamabad, Pakistan
Never buy in a hurry, know exactly what powers can be incident on the photodiodes and of course read in detail the specifications before plunging.
~Rama Raj, Research & Development, Marcoussis, FRANCE
First consider about the wavelength range to be detected. Then choose a PD made of the most suitable materials.
~Wolfgang P, Design Engineer, Berlin, Germany
Photo diode sensitivity can be adjustable easily.
~DINESH JAGADAL, Design Engineer, HUBLI, INDIA
Same as above. Every application is different.
~Research & Development, Mt. Waverley, Australia
Think about proper application.
~Prabhakara Rao Y, Additional General Manager Semiconductors, Bangalore, India

Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using photodiodes?
9 answers
Answers:
That it has an automatic switching off security system, compactness, options of fibre connection.
~Rama Raj, Research & Development, Marcoussis, FRANCE
It can be used as sensor in proximity switch, sensitivity in this case should be high.
~DINESH JAGADAL, Design Engineer, HUBLI, INDIA
Be careful about the speed vs. NEP specs. The values given are often incompatible.
~Kevin Lehmann, Faculty/Staff, Crozet, VA
Signal to Noise Ratio of a Photodiode (PD) is very important.
~Babar H, Research & Development, Islamabad, Pakistan
Choose right photo diodes matching with requirement.
~Prabhakara Rao Y, Additional General Manager Semiconductors, Bangalore, India
No. Advice would be very application specific.
~Research & Development, Mt. Waverley, Australia
Protect against excess current.
~Wolfgang P, Design Engineer, Berlin, Germany
Low parasitical capacitance
~Shaofeng Wang, Design Engineer, Beijing, China
Read the specs.
~Design Engineer, Ibiza, Spain


Related eNewsletters
See More

Also on GlobalSpec...
  • Receive email updates on new products and suppliers of interest to you
  • Online, interactive conferences / trade shows featuring latest news and industry trends
  • CR4
    Q&A and discussion for the engineering, scientific, and technical community
  • Engineering and scientific news from hundreds of sources
  • Industrial manufacturers and distributors